Description:WAve prediction Model
Abstract:Ireland has a wide continental shelf in the west and shallow waters in the east. Storms originating in Caribbean and Labrador Sea have a significant effect in the North East Atlantic. The Irish coastline, receives the brunt of the weather systems from the North Atlantic, so storm impacts will be extremely significant for coastal erosion and subsequent sediment transport (Devoy, 1994; Swift et al., 2005; Lozano et al., 2004; Cooper et al., 2004). As part of the nationally funded programme by Higher Education Authority in Ireland, an ongoing project is developing a wave future cast (two 10-year segments). This process consists of running a wave model (WAM) to generate wave information (height, swell, period etc.) for the entire Irish territorial waters on a fine resolution grid of 5km. The forecast is driven by boundary conditions generated by running WAM over a much larger domain in the North Atlantic, driven by a regional climate model run by Met Eireann, the national weather service.<BR/>The WAM-model is a third generation wave model which solves the wave transport equation explicitly without any presumptions on the shape of the wave spectrum. It was developed at the Max-Planck-Institut für Meteorologie in Hamburg (Germany) by S. and K. Hasselmann in conjunction with P. Janssen and G. Komen (KNMI, Netherlands) and L. Zambreski and H. Günther (GKSS, Germany, ECMWF, Reading, UK). The model runs on any given regional or global grid with a relevant topographic dataset. The propagation can be done on a latitudinal-longitudinal or on a cartesian grid that can be nested and run in shallow or deep water. The model outputs significant wave height, mean wave direction and frequency, the swell wave height and mean direction, wind stress fields corrected by including the wave induced stress and the drag coefficient at each grid point at chosen output times. The output also includes the 2D wave spectrum at chosen grid points and times. The CPU time and memory usage depend on the region of interest and the grid resolution.